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Nice to see the mixture models being tested in nMonte. We know there is some sort of relationship between the Mota-related Ethiopian highland ancestry, and hunter-gatherers farther south, so it's not surprising that both groups can be used in the models. Although I think it's notable that it prefers the Khoisan populations for the Tanzanian pastoralist.

As you have noted in the past, there is some diffuse "San" affinity that is associated with Mota/Omotic-related ancestry. The authors of this paper even manage to fit some Hadza, as well as the Kenya 400BP and Tanzania Pemba 1400BP samples, as 100% Mota-related. These models look rather crude though, and Mota-related populations have vastly different uniparental markers from East African HGs sampled by Hirbo (e.g. the latter have lot of mtDNA L0f, also common in modern South Cushites, and interestingly found in 1 ancient Malawian). I would bet that with some new aDNA from East African HGs south of Ethiopia, or perhaps even the modern East African HGs sampled by Hirbo, they would be a much better fit for the HG ancestry in South Cushites, as well as the "Mota-related" ancient Kenyan/Tanzanian samples.